Systems and methods for providing a feature game

ABSTRACT

An electronic gaming machine includes a game controller configured to (a) determine that a feature game triggers; (b) activate a feature game; (c) display a plurality of feature game reels, a prize position area positioned above the plurality of feature game reels, and a credit stack positioned above the prize position area, the credit stack includes credit prizes potentially available to be won by the player; (d) automatically move at least one credit prize from the credit stack into the prize position area; (e) generate a first game outcome on the plurality of reels; (f) determine that at least one of the displayed symbols for the first game outcome is a prize symbol; (g) provide the at least one credit prize; (h) increase a multiplier by a predetermined amount; and (i) display the multiplier as an applicable multiplier for a credit prize won during a subsequent spin.

CROSS REFERENCE TO RELATED APPLICATIONS

The present application is related to U.S. patent application Ser. No.29/701,488, filed Aug. 12, 2019, entitled “DISPLAY SCREEN OR PORTIONTHEREOF WITH A TRANSITIONAL GAMING MACHINE INTERFACE,” and U.S. patentapplication Ser. No. 29/702,721 filed Aug. 21, 2019, entitled “DISPLAYSCREEN OR PORTION THEREOF WITH A GAMING MACHINE INTERFACE,” thedisclosures of which are hereby incorporated by reference in theirentireties.

TECHNICAL FIELD

The field of disclosure relates generally to electronic gaming, and moreparticularly, to systems and methods for providing a feature game on anelectronic gaming device.

BACKGROUND

Electronic gaming machines (EGMs), or gaming devices, provide a varietyof wagering games such as, for example, and without limitation, slotgames, video poker games, video blackjack games, roulette games, videobingo games, keno games, and other types of games that are frequentlyoffered at casinos and other locations. Play on EGMs typically involvesa player establishing a credit balance by inserting or otherwisesubmitting money and placing a monetary wager (deducted from the creditbalance) on one or more outcomes of an instance, or play, of a primarygame, sometimes referred to as a base game. In many games, a player mayqualify for secondary games or bonus rounds by attaining a certainwinning combination or other triggering event in the base game.Secondary games provide an opportunity to win additional game instances,credits, awards, jackpots, progressives, etc. Awards from any winningoutcomes are typically added back to the credit balance and can beprovided to the player upon completion of a gaming session or when theplayer wants to “cash out.”

Slot games are often displayed to the player in the form of varioussymbols arranged in a row-by-column grid, or “matrix,” which may definea plurality of symbol display positions, and which may be generated byspinning a plurality of reels, each of which may correspond to arespective column of the matrix. Specific matching combinations ofsymbols along predetermined paths, or paylines, drawn through the matrixindicate the outcome of the game. The display typically highlightswinning combinations and outcomes for ready identification by theplayer. Matching combinations and their corresponding awards are usuallyshown in a “pay-table” that is available to the player for reference.Often, the player may vary his/her wager to included differing numbersof paylines and/or the amount bet on each line. By varying the wager,the player may sometimes alter the frequency or number of winningcombinations, the frequency or number of secondary games, and/or theamount awarded.

Typical games use a random number generator (RNG) to randomly determinethe outcome of each game. The game is designed to return a certainpercentage of the amount wagered back to the player, referred to asreturn to player (RTP), over the course of many plays or instances ofthe game. The RTP and randomness of the RNG are fundamental to ensuringthe fairness of the games and are therefore highly regulated. The RNGmay be used to randomly determine the outcome of a game and symbols maythen be selected that correspond to that outcome. Alternatively, the RNGmay be used to randomly select the symbols whose resulting combinationsdetermine the outcome. Notably, some games may include an element ofskill on the part of the player and are therefore not entirely random.

BRIEF DESCRIPTION

In one aspect, an electronic gaming machine is provided. The electronicgaming device includes at least one display device, a player inputinterface configured to receive player input from a player, a creditinput device configured to receive a credit wager, and a game controllerconfigured to execute instructions stored in a tangible, non-transitory,computer-readable storage medium, which, when executed by the gamecontroller, cause the game controller to determine, during a base gameinitiated in response to receiving the credit wager, that a feature gametrigger condition is satisfied. The instructions also cause the gamecontroller to activate, in response to the feature game triggercondition, a feature game within the base game, the feature gameincluding a plurality of feature game reels. The instructions furthercause the game controller to display, on the at least one display deviceand in response to activating the feature game, the plurality of featuregame reels, a prize position area positioned above the plurality offeature game reels, and a credit stack positioned above the prizeposition area, the credit stack includes credit prizes potentiallyavailable to be won by the player. The instructions also cause the gamecontroller to automatically move at least one credit prize from thecredit stack into the prize position area. The instructions furthercause the game controller to generate a first game outcome based on arandom number generator to display one or more symbols for each of theplurality of reels. The instructions also cause the game controller todetermine that at least one of the displayed symbols for the first gameoutcome is a winning symbol. The instructions further cause the gamecontroller to provide the at least one credit prize in response to thedetermining. The instructions also cause the game controller to increasea multiplier by a predetermined amount based on the determining. Theinstructions further cause the game controller to display, on the atleast one display device, the multiplier as an applicable multiplier fora subsequent credit prize won during a subsequent spin.

In another aspect, a non-transitory computer-readable media containinginstructions embodied thereon is provided. When executed by a processor,the instructions cause the processor to cause to be displayed, on atleast one display device of an electronic gaming device and in responseto activating a feature game, a plurality of feature game reels, a prizeposition area positioned above the plurality of feature game reels, anda credit stack positioned above the prize position area. The creditstack includes credit prizes potentially available to be won by theplayer. The instructions also cause the processor to generate a firstgame outcome based on a random number generator to display one or moresymbols for each of the plurality of reels. The instructions furthercause the processor to determine that at least one of the displayedsymbols for the first game outcome is a prize symbol. The instructionsalso cause the processor to provide the at least one credit prize inresponse to the determining. The instructions further cause theprocessor to increase a multiplier by a predetermined amount based onthe determining. The instructions also cause the processor to cause tobe displayed, on the at least one display, the multiplier as anapplicable multiplier for a subsequent credit prize won during asubsequent spin.

In yet another aspect, a method of electronic gaming implemented on anelectronic gaming machine is provided. The electronic gaming machineincludes at least one display device, a player input interface, a gamecontroller, and a credit input mechanism. The method includesdisplaying, on the at least one display device and in response toactivating the feature game, the plurality of feature game reels, aprize position area positioned above the plurality of feature gamereels, and a credit stack positioned above the prize position area. Thecredit stack includes credit prizes potentially available to be won bythe player. The method also includes animating, on the at least onedisplay device, moving a first row of credit prizes from the creditstack into the prize position area. The method further includesdisplaying one or more reel spins that land on a symbol for each of theplurality of reels. The method also includes presenting, on the at leastone display device, that at least one credit prize from the first row ofcredit prizes has been awarded for one or more reels that land on awinning symbol. The method further includes animating, on the at leastone display device, moving a second row of credit prizes from the creditstack into the position area. The method also includes increasing amultiplier by a predetermined amount based on the determining. Themethod further includes display, on the display, the multiplier as anapplicable multiplier for a subsequent credit prize won during asubsequent spin.

BRIEF DESCRIPTION OF THE DRAWINGS

An example embodiment of the subject matter disclosed will now bedescribed with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a plurality of electronic gamingdevices (EGMs) networked with various gaming-related servers;

FIG. 2 is a block diagram of an example EGM that includes a plurality oflighting controllers;

FIG. 3 illustrates, in block diagram form, an embodiment of a gameprocessing architecture that implements a game processing pipeline forthe play of a game in accordance with some embodiments described herein;

FIG. 4 is a diagram illustrating an initial configuration of a play areaof an example base game;

FIG. 5 is a diagram illustrating the play area shown at FIG. 4 when afirst bonus feature is activated in the example base game;

FIG. 6 is a diagram illustrating the play area shown at FIG. 4 when asecond bonus feature is activated in the example base game;

FIGS. 7A-7B is a diagram illustrating the play area shown at FIG. 4 whena third bonus feature is activated in the example base game;

FIG. 8 is a diagram illustrating the play area shown at FIG. 4 when afourth bonus feature is activated in the example base game;

FIG. 9 is a diagram illustrating the play area shown at FIG. 4 when anexample feature game is activated; and

FIGS. 10A-10E are diagrams illustrating game play progression for theexample feature game.

FIGS. 11A-11B are a flowchart for a method of providing the base gamefeatures and feature game described herein.

DETAILED DESCRIPTION

Embodiments of the present disclosure provide systems and methods forproviding bonus features of a base game as well as providing a featuregame triggered within the base game. An electronic gaming machineprovides a base game with several bonus features that may be triggeredwithin the base game. The electronic gaming machine is also configuredto present a feature game in response to a feature game triggercondition. The feature game may be activated when a certain number offeature game symbols (e.g., scatter symbols) are displayed on a gameplay area during play of the base game. In response to activating thefeature game, the electronic gaming machine displays a plurality offeature game reels, a credit stack, and a prize position area above thefeature game reels. In an effort to enhance the experience of players,game designers often seek to develop more complex wagering games thatoffer new game mechanics. As wagering games become more complex,technical problems arise. One technical problem with more complexwagering games is controlling the return to player (RTP). Anothertechnical problem includes controlling volatility of games.

The present disclosure describes an electronic gaming machine thatprovides a technical solution to at least these problems. In oneexample, a feature game is provided that can provide control of RTP andvolatility for operators. The feature game includes three feature gamereels, with each reel displaying a single symbol display position. Eachof the three feature game reels, in an example embodiment, includes onlyprize symbols and blank spaces on the three feature game reels. Aboveeach reel is a prize position area for that reel, as well as a creditstack above the prize position area. In an example embodiment, thecredit stack above the prize position area includes seven credit prizesarranged in ascending credit value, thereby defining seven prize tiers.When the feature game is triggered, the electronic gaming machineremoves the base game contents and displays the feature game, giving theplayer five free spins in the feature game. Before the first free spin,one credit prize from each of the credit stacks shifts down into theprize position area above each reel. Upon spinning the feature gamereels, each reel lands on either a prize symbol or a blank. Whenever aprize symbol appears on a reel, the credit prize appearing above thatreel is awarded to the player. As such, in each spin, the player has achance to win any of the three credit prizes above each of the reels.

In addition, in the example embodiment, each reel may also have amultiplier associated with that reel. Any credit prizes awarded for thatwheel are multiplied by the multiplier for that reel. Each of themultipliers begin at a base value of a times one (“×1”) multiplier.Whenever a prize symbol appears on a reel, the multiplier is advanced(e.g., increased in value by one or more). As the multiplier(s)increase, the multiplier is displayed near the reel to inform the playerof the presence of the multiplier, thereby heightening excitement in thegame. Further, whenever the reel does not land on a prize symbol (e.g.,lands on a blank), the multiplier for that reel is reset to the basevalue (e.g., to “×1”). As such, the multiplier for a given reel maycontinue to increase in value as long as the reel continues to land onprize symbols, but resets once the prize symbol is not achieved.

To control RTP and volatility in the feature game, the feature gameprovides various components used to provide the feature game. First, thefeature game assigns fixed low-end values to the prizes within the firsttwo prize tiers and a fixed top-end value to the prizes within the top(e.g., seventh) prize tier. For the third through sixth tiers, thefeature game determines the prize values from a limited set of options(e.g., two to ten credit values ranging between the second tier prizevalues and the top tier prize value). For each possible prize value, thefeature game provides a pre-configured, lookup table with weights(“prize tier table”) that is configured to control RTP and volatility.During game play, the feature game sets the fixed first, second, andseventh prize tiers, but selects the prize values for each of the thirdthrough sixth tiers (e.g., randomly, based on a weighted RNG result,sorted lowest to highest). The prize tier tables used for the first,fourth, and seventh tier are used consistently for those tiers, as theprize values for those tiers are fixed. For the third through sixthtiers, those prize values may change between feature game instances, soselection of which lookup table to use for each prize tier may alsochange. Each prize tier table is pre-configured to control RTP for thattier based on, for example, the award value for that lookup table, thechances of the player progressing to that round, the chances of havingeach particular multiplier applied to the award value for that lookuptable, or such. Further, the feature game is configured to controlvolatility by configuring the early, fixed small prize tier tables(e.g., the first and second tiers) to award lesser amounts morefrequently, and shifting to higher award amounts less frequently inhigher tiers. The potential multipliers, when considered duringconfiguration of the prize tier tables, can be configured such as toincrease volatility of the game. As such, the prize tier tables enablecontrol of both RTP and volatility for the feature game.

FIG. 1 illustrates several different models of EGMs which may benetworked to various gaming related servers. Shown is a system 100 in agaming environment including one or more server computers 102 (e.g.,slot servers of a casino) that are in communication, via acommunications network, with one or more gaming devices 104A-104X (EGMs,slots, video poker, bingo machines, etc.) that can implement one or moreaspects of the present disclosure. The gaming devices 104A-104X mayalternatively be portable and/or remote gaming devices such as, but notlimited to, a smart phone, a tablet, a laptop, or a game console,although such devices may require specialized software and/or hardwareto comply with regulatory requirements regarding devices used forwagering or games of chance in which monetary awards are provided.

Communication between the gaming devices 104A-104X and the servercomputers 102, and among the gaming devices 104A-104X, may be direct orindirect, such as over the Internet through a web site maintained by acomputer on a remote server or over an online data network includingcommercial online service providers, Internet service providers, privatenetworks, and the like. In other embodiments, the gaming devices104A-104X may communicate with one another and/or the server computers102 over RF, cable TV, satellite links and the like.

In some embodiments, server computers 102 may not be necessary and/orpreferred. For example, in one or more embodiments, a stand-alone gamingdevice such as gaming device 104A, gaming device 104B or any of theother gaming devices 104C-104X can implement one or more aspects of thepresent disclosure. However, it is typical to find multiple EGMsconnected to networks implemented with one or more of the differentserver computers 102 described herein.

The server computers 102 may include a central determination gamingsystem server 106, a ticket-in-ticket-out (TITO) system server 108, aplayer tracking system server 110, a progressive system server 112,and/or a casino management system server 114. Gaming devices 104A-104Xmay include features to enable operation of any or all servers for useby the player and/or operator (e.g., the casino, resort, gamingestablishment, tavern, pub, etc.). For example, game outcomes may begenerated on a central determination gaming system server 106 and thentransmitted over the network to any of a group of remote terminals orremote gaming devices 104A-104X that utilize the game outcomes anddisplay the results to the players.

Gaming device 104A is often of a cabinet construction which may bealigned in rows or banks of similar devices for placement and operationon a casino floor. The gaming device 104A often includes a main door 154which provides access to the interior of the cabinet. Gaming device 104Atypically includes a button area or button deck 120 accessible by aplayer that is configured with input switches or buttons 122, an accesschannel for a bill validator 124, and/or an access channel for aticket-out printer 126.

In FIG. 1, gaming device 104A is shown as a Relm XL™ model gaming devicemanufactured by Aristocrat® Technologies, Inc. As shown, gaming device104A is a reel machine having a gaming display area 118 comprising anumber (typically 3 or 5) of mechanical reels 130 with various symbolsdisplayed on them. The reels 130 are independently spun and stopped toshow a set of symbols within the gaming display area 118 which may beused to determine an outcome to the game.

In many configurations, the gaming machine 104A may have a main display128 (e.g., video display monitor) mounted to, or above, the gamingdisplay area 118. The main display 128 can be a high-resolution LCD,plasma, LED, or OLED panel which may be flat or curved as shown, acathode ray tube, or other conventional electronically controlled videomonitor.

In some embodiments, the bill validator 124 may also function as a“ticket-in” reader that allows the player to use a casino issued creditticket to load credits onto the gaming device 104A (e.g., in a cashlessticket (“TITO”) system). In such cashless embodiments, the gaming device104A may also include a “ticket-out” printer 126 for outputting a creditticket when a “cash out” button is pressed. Cashless TITO systems areused to generate and track unique bar-codes or other indicators printedon tickets to allow players to avoid the use of bills and coins byloading credits using a ticket reader and cashing out credits using aticket-out printer 126 on the gaming device 104A. The gaming machine104A can have hardware meters for purposes including ensuring regulatorycompliance and monitoring the player credit balance. In addition, therecan be additional meters that record the total amount of money wageredon the gaming machine, total amount of money deposited, total amount ofmoney withdrawn, total amount of winnings on gaming device 104A.

In some embodiments, a player tracking card reader 144, a transceiverfor wireless communication with a player's smartphone, a keypad 146,and/or an illuminated display 148 for reading, receiving, entering,and/or displaying player tracking information is provided in EGM 104A.In such embodiments, a game controller within the gaming device 104A cancommunicate with the player tracking system server 110 to send andreceive player tracking information.

Gaming device 104A may also include a bonus topper wheel 134. When bonusplay is triggered (e.g., by a player achieving a particular outcome orset of outcomes in the primary game), bonus topper wheel 134 isoperative to spin and stop with indicator arrow 136 indicating theoutcome of the bonus game. Bonus topper wheel 134 is typically used toplay a bonus game, but it could also be incorporated into play of thebase or primary game.

A candle 138 may be mounted on the top of gaming device 104A and may beactivated by a player (e.g., using a switch or one of buttons 122) toindicate to operations staff that gaming device 104A has experienced amalfunction or the player requires service. The candle 138 is also oftenused to indicate a jackpot has been won and to alert staff that a handpayout of an award may be needed.

There may also be one or more information panels 152 which may be aback-lit, silkscreened glass panel with lettering to indicate generalgame information including, for example, a game denomination (e.g.,$0.25 or $1), pay lines, pay tables, and/or various game relatedgraphics. In some embodiments, the information panel(s) 152 may beimplemented as an additional video display.

Gaming devices 104A have traditionally also included a handle 132typically mounted to the side of main cabinet 116 which may be used toinitiate game play.

Many or all the above described components can be controlled bycircuitry (e.g., a gaming controller) housed inside the main cabinet 116of the gaming device 104A, the details of which are shown in FIG. 2.

Note that not all gaming devices suitable for implementing embodimentsof the present disclosure necessarily include top wheels, top boxes,information panels, cashless ticket systems, and/or player trackingsystems. Further, some suitable gaming devices have only a single gamedisplay that includes only a mechanical set of reels and/or a videodisplay, while others are designed for bar counters or table tops andhave displays that face upwards.

An alternative example gaming device 104B illustrated in FIG. 1 is theArc™ model gaming device manufactured by Aristocrat® Technologies, Inc.Note that where possible, reference numerals identifying similarfeatures of the gaming device 104A embodiment are also identified in thegaming device 104B embodiment using the same reference numbers. Gamingdevice 104B does not include physical reels and instead shows game playfunctions on main display 128. An optional topper screen 140 may be usedas a secondary game display for bonus play, to show game features orattraction activities while a game is not in play, or any otherinformation or media desired by the game designer or operator. In someembodiments, topper screen 140 may also or alternatively be used todisplay progressive jackpot prizes available to a player during play ofgaming device 104B.

Example gaming device 104B includes a main cabinet 116 including a maindoor 154 which opens to provide access to the interior of the gamingdevice 104B. The main or service door 154 is typically used by servicepersonnel to refill the ticket-out printer 126 and collect bills andtickets inserted into the bill validator 124. The main or service door154 may also be accessed to reset the machine, verify and/or upgrade thesoftware, and for general maintenance operations.

Another example gaming device 104C shown is the Helix™ model gamingdevice manufactured by Aristocrat® Technologies, Inc. Gaming device 104Cincludes a main display 128A that is in a landscape orientation.Although not illustrated by the front view provided, the landscapedisplay 128A may have a curvature radius from top to bottom, oralternatively from side to side. In some embodiments, display 128A is aflat panel display. Main display 128A is typically used for primary gameplay while secondary display 128B is typically used for bonus game play,to show game features or attraction activities while the game is not inplay or any other information or media desired by the game designer oroperator. In some embodiments, example gaming device 104C may alsoinclude speakers 142 to output various audio such as game sound,background music, etc.

Many different types of games, including mechanical slot games, videoslot games, video poker, video black jack, video pachinko, keno, bingo,and lottery, may be provided with or implemented within the depictedgaming devices 104A-104C and other similar gaming devices. Each gamingdevice may also be operable to provide many different games. Games maybe differentiated according to themes, sounds, graphics, type of game(e.g., slot game vs. card game vs. game with aspects of skill),denomination, number of paylines, maximum jackpot, progressive ornon-progressive, bonus games, and may be deployed for operation in Class2 or Class 3, etc.

FIG. 2 is a block diagram depicting exemplary internal electroniccomponents of a gaming device 200 connected to various external systems.All or parts of the example gaming device 200 shown could be used toimplement any one of the example gaming devices 104A-×depicted inFIG. 1. As shown in FIG. 2, gaming device 200 includes a topper display216 or another form of a top box (e.g., a topper wheel, a topper screen,etc.) that sits above cabinet 218. Cabinet 218 or topper display 216 mayalso house a number of other components which may be used to addfeatures to a game being played on gaming device 200, including speakers220, a ticket printer 222 which prints bar-coded tickets or other mediaor mechanisms for storing or indicating a player's credit value, aticket reader 224 which reads bar-coded tickets or other media ormechanisms for storing or indicating a player's credit value, and aplayer tracking interface 232. Player tracking interface 232 may includea keypad 226 for entering information, a player tracking display 228 fordisplaying information (e.g., an illuminated or video display), a cardreader 230 for receiving data and/or communicating information to andfrom media or a device such as a smart phone enabling player tracking.FIG. 2 also depicts utilizing a ticket printer 222 to print tickets fora TITO system server 108. Gaming device 200 may further include a billvalidator 234, player-input buttons 236 for player input, cabinetsecurity sensors 238 to detect unauthorized opening of the cabinet 218,a primary game display 240, and a secondary game display 242, eachcoupled to and operable under the control of game controller 202.

The games available for play on the gaming device 200 are controlled bya game controller 202 that includes one or more processors 204.Processor 204 represents a general-purpose processor, a specializedprocessor intended to perform certain functional tasks, or a combinationthereof. As an example, processor 204 can be a central processing unit(CPU) that has one or more multi-core processing units and memorymediums (e.g., cache memory) that function as buffers and/or temporarystorage for data. Alternatively, processor 204 can be a specializedprocessor, such as an application specific integrated circuit (ASIC),graphics processing unit (GPU), field-programmable gate array (FPGA),digital signal processor (DSP), or another type of hardware accelerator.In another example, processor 204 is a system on chip (SoC) thatcombines and integrates one or more general-purpose processors and/orone or more specialized processors. Although FIG. 2 illustrates thatgame controller 202 includes a single processor 204, game controller 202is not limited to this representation and instead can include multipleprocessors 204 (e.g., two or more processors).

FIG. 2 illustrates that processor 204 is operatively coupled to memory208. Memory 208 is defined herein as including volatile and non-volatilememory and other types of non-transitory data storage components.Volatile memory is memory that do not retain data values upon loss ofpower. Non-volatile memory is memory that do retain data upon a loss ofpower. Examples of memory 208 include random access memory (RAM),read-only memory (ROM), hard disk drives, solid-state drives, USB flashdrives, memory cards accessed via a memory card reader, floppy disksaccessed via an associated floppy disk drive, optical discs accessed viaan optical disc drive, magnetic tapes accessed via an appropriate tapedrive, and/or other memory components, or a combination of any two ormore of these memory components. In addition, examples of RAM includestatic random access memory (SRAM), dynamic random access memory (DRAM),magnetic random access memory (MRAM), and other such devices. Examplesof ROM include a programmable read-only memory (PROM), an erasableprogrammable read-only memory (EPROM), an electrically erasableprogrammable read-only memory (EEPROM), or other like memory device.Even though FIG. 2 illustrates that game controller 202 includes asingle memory 208, game controller 208 could include multiple memories208 for storing program instructions and/or data.

Memory 208 can store one or more game programs 206 that provide programinstructions and/or data for carrying out various embodiments (e.g.,game mechanics) described herein. Stated another way, game program 206represents an executable program stored in any portion or component ofmemory 208. In one or more embodiments, game program 206 is embodied inthe form of source code that includes human-readable statements writtenin a programming language or machine code that contains numericalinstructions recognizable by a suitable execution system, such as aprocessor 204 in a game controller or other system. Examples ofexecutable programs include: (1) a compiled program that can betranslated into machine code in a format that can be loaded into arandom access portion of memory 208 and run by processor 204; (2) sourcecode that may be expressed in proper format such as object code that iscapable of being loaded into a random access portion of memory 208 andexecuted by processor 204; and (3) source code that may be interpretedby another executable program to generate instructions in a randomaccess portion of memory 208 to be executed by processor 204.

Alternatively, game programs 206 can be setup to generate one or moregame rounds based on instructions and/or data that gaming device 200exchange with one or more remote gaming devices, such as a centraldetermination gaming system server 106 (not shown in FIG. 2 but shown inFIG. 1). With regard to primary games played on the gaming device 200,the term “game round” refers to a play or a round of a game that gamingdevice 200 presents (e.g., via a user interface (UI)) to a player (e.g.,the game play occurring after submission of a single wager). The gameround is communicated to gaming device 200 via the network 214 and thendisplayed on gaming device 200. For example, gaming device 200 mayexecute game program 206 as video streaming software that allows thegame to be displayed on gaming device 200. When a game is stored ongaming device 200, it may be loaded from memory 208 (e.g., from a readonly memory (ROM)) or from the central determination gaming systemserver 106 to memory 208.

Gaming devices, such as gaming device 200, are highly regulated toensure fairness and, in many cases, gaming device 200 is operable toaward monetary awards (e.g., typically dispensed in the form of aredeemable voucher). Therefore, to satisfy security and regulatoryrequirements in a gaming environment, hardware and softwarearchitectures are implemented in gaming devices 200 that differsignificantly from those of general-purpose computers. Adapting generalpurpose computers to function as gaming devices 200 is not simple orstraightforward because of: (1) the regulatory requirements for gamingdevices 200, (2) the harsh environment in which gaming devices 200operate, (3) security requirements, (4) fault tolerance requirements,and (5) the requirement for additional special purpose componentryenabling functionality of an EGM. These differences require substantialengineering effort with respect to game design implementation, gamemechanics, hardware components, and software.

In some jurisdictions, one regulatory requirement for games running ongaming device 200 may include complying with a certain level ofrandomness. Typically, gaming jurisdictions mandate that gaming devices200 satisfy a minimum level of randomness without specifying how agaming device 200 should achieve this level of randomness. To comply,FIG. 2 illustrates that gaming device 200 includes a random numbergenerator (RNG) 212 that utilizes hardware and/or software to generateRNG outcomes that lack any pattern. The RNG operations are oftenspecialized and non-generic in order to comply with regulatory andgaming requirements. For example, in a reel game, game program 206 caninitiate multiple RNG calls to RNG 212 to generate RNG outcomes, whereeach RNG call and RNG outcome corresponds to an outcome for a reel. Inanother example, gaming device 200 can be a Class II gaming device whereRNG 212 generates RNG outcomes for creating Bingo cards. In one or moreembodiments, RNG 212 could be one of a set of RNGs operating on gamingdevice 200. Game developers could vary the degree of true randomness foreach RNG (e.g., pseudorandom) and utilize specific RNGs depending ongame requirements.

Another regulatory requirement for running games on gaming device 200may include ensuring a certain level of return to player (RTP). Similarto the randomness requirement discussed above, numerous gamingjurisdictions also mandate that gaming device 200 provides a minimumlevel of RTP (e.g., RTP of at least 75%). FIG. 2 illustrates that gamingdevice 200 includes an RNG conversion engine 210 that translates the RNGoutcome from RNG 212 to a game outcome presented to a player. To meet adesignated RTP, a game developer can setup the RNG conversion engine 210to utilize one or more lookup tables to translate the RNG outcome to asymbol element, stop position on a reel strip layout, and/or randomlychosen aspect of a game feature. As an example, the lookup tables canregulate a prize payout amount for each RNG outcome and how often thegaming device 200 pays out the prize payout amounts. The RNG conversionengine 210 could utilize one lookup table to map the RNG outcome to agame outcome displayed to a player and a second lookup table as a paytable for determining the prize payout amount for each game outcome. Themapping between the RNG outcome to the game outcome controls thefrequency in hitting certain prize payout amounts.

FIG. 2 also depicts that gaming device 200 is connected over network 214to player tracking system server 110. Player tracking system server 110may be, for example, an OASIS® system manufactured by Aristocrat®Technologies, Inc. Player tracking system server 110 is used to trackplay (e.g. amount wagered, games played, time of play and/or otherquantitative or qualitative measures) for individual players so that anoperator may reward players in a loyalty program. The player may use theplayer tracking interface 232 to access his/her account information,activate free play, and/or request various information. Player trackingor loyalty programs seek to reward players for their play and help buildbrand loyalty to the gaming establishment. The rewards typicallycorrespond to the player's level of patronage (e.g., to the player'splaying frequency and/or total amount of game plays at a given casino).Player tracking rewards may be complimentary and/or discounted meals,lodging, entertainment and/or additional play. Player trackinginformation may be combined with other information that is now readilyobtainable by a casino management system.

When a player wishes to play the gaming device 200, he/she can insertcash or a ticket voucher through a coin acceptor (not shown) or billvalidator 234 to establish a credit balance on the gamine machine. Thecredit balance is used by the player to place wagers on rounds of thegame and to receive credit awards based on the outcome of winningrounds. The credit balance is decreased by the amount of each wager andincreased upon a win. The player can add additional credits to thebalance at any time. The player may also optionally insert a loyaltyclub card into the card reader 230. During the game, the player viewswith one or more UIs, the game outcome on one or more of the primarygame display 240 and secondary game display 242. Other game and prizeinformation may also be displayed.

For each game round, a player may make selections, which may affect playof the game. For example, the player may vary the total amount wageredby selecting the amount bet per line and the number of lines played. Inmany games, the player is asked to initiate or select options duringcourse of game play (such as spinning a wheel to begin a bonus round orselect various items during a feature game). The player may make theseselections using the player-input buttons 236, the primary game display240 which may be a touch screen, or using some other device whichenables a player to input information into the gaming device 200.

During certain game events, the gaming device 200 may display visual andauditory effects that can be perceived by the player. These effects addto the excitement of a game, which makes a player more likely to enjoythe playing experience. Auditory effects include various sounds that areprojected by the speakers 220. Visual effects include flashing lights,strobing lights or other patterns displayed from lights on the gamingdevice 200 or from lights behind the information panel 152 (FIG. 1).

When the player is done, he/she cashes out the credit balance (typicallyby pressing a cash out button to receive a ticket from the ticketprinter 222). The ticket may be “cashed-in” for money or inserted intoanother machine to establish a credit balance for play.

Although FIGS. 1 and 2 illustrates specific embodiments of a gamingdevice (e.g., gaming devices 104A-104X and 200), the disclosure is notlimited to those embodiments shown in FIGS. 1 and 2. For example, notall gaming devices suitable for implementing embodiments of the presentdisclosure necessarily include top wheels, top boxes, informationpanels, cashless ticket systems, and/or player tracking systems.Further, some suitable gaming devices have only a single game displaythat includes only a mechanical set of reels and/or a video display,while others are designed for bar counters or table tops and havedisplays that face upwards. Additionally, or alternatively, gamingdevices 104A-104X and 200 can include credit transceivers thatwirelessly communicate (e.g., Bluetooth or other near-fieldcommunication technology) with one or more mobile devices to performcredit transactions. As an example, bill validator 234 could contain orbe coupled to the credit transceiver that output credits from and/orload credits onto the gaming device 104A by communicating with aplayer's smartphone (e.g., a digital wallet interface). Gaming devices104A-104X and 200 may also include other processors that are notseparately shown. Using FIG. 2 as an example, gaming device 200 couldinclude display controllers (not shown in FIG. 2) configured to receivevideo input signals or instructions to display images on game displays240 and 242. Alternatively, such display controllers may be integratedinto the game controller 202. The use and discussion of FIGS. 1 and 2are examples to facilitate ease of description and explanation.

FIG. 3 illustrates, in block diagram form, an embodiment of a gameprocessing architecture 300 that implements a game processing pipelinefor the play of a game in accordance with some embodiments describedherein. In the example embodiment, the game processing architecture 300may be provided on the gaming devices 104, 200 (e.g., by game controller202). As shown in FIG. 3, the gaming processing pipeline starts withhaving a UI system 302 receive one or more player inputs for the gameinstance. Based on the player input(s), the UI system 302 generates andsends one or more RNG calls to a game processing backend system 314.Game processing backend system 314 then processes the RNG calls with RNGengine 316 to generate one or more RNG outcomes. The RNG outcomes arethen sent to the RNG conversion engine 320 to generate one or more gameoutcomes for the UI system 302 to display to a player. The gameprocessing architecture 300 can implement the game processing pipelineusing a gaming device, such as gaming devices 104A-104X and 200 shown inFIGS. 1 and 2, respectively. Alternatively, portions of the gamingprocessing architecture 300 can implement the game processing pipelineusing a gaming device and one or more remote gaming devices, such ascentral determination gaming system server 106 shown in FIG. 1.

The UI system 302 includes one or more UIs that a player can interactwith. The UI system 302 could include one or more game play UIs 304, oneor more bonus game play UIs 308, and one or more multiplayer UIs 312,where each UI type includes one or more mechanical UIs and/or graphicalUIs (GUIs). In other words, game play UI 304, bonus game play UI 304,and the multiplayer UI 312 may utilize a variety of UI elements, such asmechanical UI elements (e.g., physical “spin” button or mechanicalreels) and/or GUI elements (e.g., virtual reels shown on a video displayor a virtual button deck) to receive player inputs and/or present gameplay to a player. Using FIG. 3 as an example, the different UI elementsare shown as game play UI elements 306A-306N and bonus game play UIelements 310A-310N.

The game play UI 304 represents a UI that a player typically interfaceswith for a base game. During a game instance of a base game, the gameplay UI elements 306A-306N (e.g., GUI elements depicting one or morevirtual reels) are shown and/or made available to a user. In asubsequent game instance, the UI system 302 could transition out of thebase game to one or more bonus games. The bonus game play UI 308represents a UI that utilizes bonus game play UI elements 310A-310N fora player to interact with and/or view during a bonus game. In one ormore embodiments, at least some of the game play UI element 306A-306Nare similar to the bonus game play UI elements 310A-310N. In otherembodiments, the game play UI element 306A-306N can differ from to thebonus game play UI elements 310A-310N.

Based on the player inputs, the UI system 302 could generate RNG callsto a game processing backend system 314. As an example, the UI system302 could use one or more application programming interfaces (APIs) togenerate the RNG calls. To process the RNG calls, the RNG engine 316could utilize gaming RNG 318 and/or non-gaming RNGs 319A-319N. GamingRNG 318 corresponds to RNG 212 shown in FIG. 2. As previously discussedwith reference to FIG. 2, gaming RNG 318 often performs specialized andnon-generic operations that comply with regulatory and/or gamerequirements. For example, because of regulation requirements, gamingRNG 318 could be a cryptographic random or pseudorandom number generator(PRNG) (e.g., Fortuna PRNG) that securely produces random numbers forone or more game features. To generate random numbers, gaming RNG 318could collect random data from various sources of entropy, such as froman operating system (OS). Alternatively, non-gaming RNGs 319A-319N maynot be cryptographically secure and/or be computational less expensive.Non-gaming RNGS 319A-319N can, thus, be used to generate outcomes fornon-gaming purposes. As an example, non-gaming RNGs 319A-319N cangenerate random numbers for such as generating random messages thatappear on the gaming device. The RNG conversion engine 320 processeseach RNG outcome from RNG engine 316 and converts the RNG outcome to aUI outcome that is feedback to the UI system 302. With reference to FIG.2, RNG conversion engine 320 corresponds to RNG conversion engine 210used for game play. As previously described, RNG conversion engine 320translates the RNG outcome from the RNG 212 to a game outcome presentedto a player. RNG conversion engine 320 utilizes one or more lookuptables 322A-322N to regulate a prize payout amount for each RNG outcomeand how often the gaming device pays out the derived prize payoutamounts. In one example, the RNG conversion engine 320 could utilize onelookup table to map the RNG outcome to a game outcome displayed to aplayer and a second lookup table as a pay table for determining theprize payout amount for each game outcome. In this example, the mappingbetween the RNG outcome to the game outcome controls the frequency inhitting certain prize payout amounts.

Different lookup tables could be utilized depending on the differentgame modes. For example, a base game may be associated with one or morebase game tables. In addition, bonus features associated with bonussymbols may be associated with one or more bonus feature tables. Forexample, as described below, if the display of a certain bonus symboltriggers the addition of extra symbol display positions, a lookup tableassociated with this particular bonus feature may be referenced todetermine how to populate the remaining symbol display positions (e.g.,to prevent having too many or too little of the same symbols on a playarea). Further, feature game events of a feature game may also beassociated with a feature game lookup table. For example, a feature gamelookup table may be referenced to determine the arrangement of a creditstack as described below. A feature game lookup table may be referencedto identify how many credit prizes to display in the credit stack, andto determine not only the value of each credit prize, but also thelocation of each credit prize within the credit stack for each round ofgameplay.

After generating the UI outcome, the game processing backend system 314sends the UI outcome to the UI system 302. Examples of UI outcomes aresymbols to display on a video reel or reel stops for a mechanical reel.In one example, if the UI outcome is for a base game, the UI system 302updates one or more game play UI elements 306A-306N, such as symbols,for the game play UI 304. In another example, if the UI outcome is for abonus game, the UI system could update one or more bonus game play UIelements 310A-310N (e.g., symbols) for the bonus game play UI 308. Inresponse to the updating the appropriate UI, the player may subsequentlyprovide additional player inputs to initiate a subsequent game instancethat progresses through the game processing pipeline.

Throughout this specification and in the claims, the terms “primarygame” and “bonus game” refer to a game session that includes more thanone game event or, simply, one or more games. The primary game maycorrespond to a primary or “base” game, as opposed to a bonus game, asdescribed below. The primary game may be initiated in response to awager or credit being received by or transferred to gaming machine 104A(shown in FIG. 1). The primary game (as well as one or more gamescomprising the primary game) may also be initiated by other game eventsincluding, for example, a player selecting a “spin” button, a startbutton, a deal button, or any other such input selector designated forinitiating a game session. The primary game may be terminatedvoluntarily in response to an input by the player indicating that theplayer wishes to stop the game or automatically by the gaming device inresponse to a termination event, such as a zero credit balance in thereel game.

Further, as used herein, the terms “bonus game,” “feature game,”“secondary game,” and “bonus game session” refer generally to a game ora component of a game involving procedures in addition to the primarygame. The feature game may be initiated during play of the primary gameand in response to a particular condition occurring during the primarygame (e.g., a trigger condition). The feature game may include aplurality of feature game events. For example, where the primary gameincludes a slot machine game, the feature game may allow players apossibility of winning more than the pay table for the primary gameindicates. Typically, a feature game outcome may depend upon aparticular symbol being displayed when one of a plurality of final gameevents takes place. In some embodiments, the outcome of the feature gamemay be unrelated to the outcome of the primary game.

In one example embodiment, a feature game with cascading credit stacksis provided. The feature game provides an alternate set of reels(“feature game reels”) that are comprised of prize symbols and blanks.Above each of the reels appears a cascading stack of credit prizes thatmay be won by the player during play of the feature game. At each spinof the feature game, the lowest credit prize for each of the creditstacks shifts down to appear as a winnable credit prize above each ofthe feature game reels. Upon each spin, if a prize symbol appears on afeature game reel, then the player is awarded the credit prize abovethat reel. Further, the awarded credit prize may be multiplied by amultiplier associated with that reel.

FIG. 4 illustrates an empty play area 402 for an example reel-based basegame provided by the gaming device 200 of FIG. 2 using the gameprocessing architecture 300 of FIG. 3. In the example embodiment, theplay area 402 that includes a plurality of reels 404 that may spin andstop (e.g., with physical reels) or may be simulated to spin and stop(e.g., with virtual reels) in response to a player submitting a wagerand initiating the base game. In some embodiments, play area 402 may bepresented by one or more EGMs 104A-104X (shown in FIG. 1) or the gamingdevice 200 (shown in FIG. 2) when a player initiates play of the basegame.

In the example embodiment, reels 404 include a first reel 406, a secondreel 408, a third reel 410, a fourth reel 412, a fifth reel 414, and asixth reel 416. However, any suitable number of reels, such as one reelto reels numbering greater than six reels, may be implemented on avariety of embodiments. Each reel 404 includes a plurality of symboldisplay positions 418 which, together, define a matrix of symbol displaypositions (e.g., represented as play area 402). Further, each reel 404is configured to display a certain number of symbols. Each symboldisplay position of each reel 404 may also include a symbol. In someembodiments, a single symbol may span multiple symbol display positions,as explained in detail below.

Reels 404 may include simulated or “virtual” reels generated anddisplayed by one or more processors 204 (such as processors of gamecontroller 202) on any game display, such as primary game display 240,secondary game display 242, topper display 216, player trackinginterface display 228, and/or any other suitable display device. Inother embodiments, reels 404 may include one or more physical reels(e.g., mechanical reels controlled by stepper motors) having a displayelement, such as a liquid crystal display (LCD), capable of displayingone or more symbols during gameplay. In other embodiments, reels 404 mayinclude a plurality of mechanical reels overlaid by an LCD panel.

In FIG. 4, all of the symbol display positions are vacant for purposesof illustrating various dimensions of reels 404 and symbol displaypositions 418 of play area 402. In the example embodiment, first reel406 is an oversized reel having relatively larger dimensions (e.g.,width and height). First reel 406 includes three oversized symboldisplay positions. First reel 406 is also configured to display symbolsthat cover one symbol display position, two symbol display positions,and three symbol display positions (e.g., with single, large symbols, asshown and described below).

In the example embodiment, second reel 408, third reel 410, and fourthreel 412 each include four symbol display positions, and each havesimilar dimensions. The symbol display positions for reels 408-412likewise have similar dimensions with respect to one another. In theexample embodiment, each of second reel 408, third reel 410, and fourthreel 412 are configured to display symbols in each symbol displayposition. In some embodiments, reels 408-412 may display symbolscovering two symbol display positions.

In the example embodiment, fifth reel 414 and sixth reel 416 of playarea 402 have similar dimensions. Fifth reel 414 and sixth reel 416 arebigger than reels 408-412 and smaller than first reel 406, and withproportionally sized symbol display positions. In some embodiments,fifth reel 414 and sixth reel 416 are the same size as reels 408-412.Fifth reel 414 and sixth reel 416 each include four symbol displaypositions. Each of fifth reel 414 and sixth reel 416 are configured todisplay symbols that cover one symbol display positions and two symboldisplay positions.

The different reel sizes and symbol sizes, as illustrated in FIG. 4,define a clearly recognizable hierarchy of symbols that emphasize bigwin potentials. In the example embodiment, symbols displayed on reels404 include “bonus” symbols, “prize” symbols, “scatter” symbols, and“standard” symbols. Each reel is configured to display different typesof symbols. In the example embodiment, bonus symbols are only displayedon first reel 406. A “bonus” symbol is three symbol positions in heightand may cover all three symbol display positions of first reel 406. Thesize of the bonus symbol is used to visually indicate, to the player, asignificant win potential associated with the bonus symbol. The examplebase game includes four bonus symbols, each associated with a differentbonus feature of the base game. The appearance of a bonus symbol maytrigger a different type of bonus feature (e.g., multipliers, “wild”symbols, extra standard symbols, cash prizes, or credit prizes). Thebonus symbols are described in greater detail below.

A prize symbol, in some embodiments, may be one, two, or three symboldisplay positions in height, and may additionally display an award. Forexample, prize symbols displayed by sixth reel 416 are two-high symbolsand may appear with a credit award or a jackpot bonus (e.g., aprogressive jackpot indicator). In the example embodiment, wins thatinclude the prize symbol(s) with identified awards will award the prizeshown on the prize symbol (e.g., a displayed credit award amount or aprogressive jackpot value) in addition to the normal Reel Power pay forthat symbol combination (e.g., an “of-a-kind” win).

A scatter symbol, in the example embodiment, covers one symbol displayposition and is configured to unlock scatter features when a certainnumber of the same scatter symbol appears on play area 402 during asingle gameplay (e.g., during a single spin). Scatter symbols may bedisplayed by second reel 408, third reel 410, fourth reel 412, fifthreel 414, and sixth reel 416. A variety of scatter symbols may bedisplayed on play area 402, including “grand prize” symbols (e.g.,indicating a maximum payout, such as a grand prize, top prize, orjackpot associated with the base game), “free spin” symbols (e.g.,indicating a free play), and “feature game” symbols (e.g., configured totrigger a feature game described herein). In the example embodiment, theappearance of three or more of the same type of scatter symbol during asingle play unlocks the associated scatter feature. For example, ifthree “free spin” symbols are displayed on play area 402, the playerunlocks a free spin. In another example, if three “grand prize” symbolsare displayed on play area 402, the player wins the grand prizeassociated with the base game. In yet another example, if three “featuregame” symbols are displayed on play area 402, the feature game (e.g., abonus game) is activated for play.

As used herein, a “standard” symbol may refer to any symbol that is nota bonus symbol, prize symbol, or scatter symbol. As used herein, a“wild” symbol may refer to any symbol capable of substituting (e.g., ona line win or ways win) for another standard symbol.

FIGS. 5-9, as described below, illustrate example bonus featuresactivated in the play area 402 when various bonus symbols are displayedon first reel 406. In the example embodiment, a player may place a wagerusing, for example, a “spin” or “play” button. In response to a playerwager, reels 406-416 are simulated to spin and stop, whereby symbolsfrom reels 406-416 may be displayed in a plurality of symbol displaypositions of play area 402 (e.g., as determined by the RNG output of thegame processing backend system 314 of gaming device 200).

In some embodiments, one or more symbol display positions of one or morereels 406-416 may be spun and stopped independently and/or one at a time(or in groups at a time). In the example embodiment, symbol displaypositions of first reel 406 are stopped first, and may display a bonussymbol while the remaining reels 408-416 continue spinning. The bonussymbol may be one of a first bonus symbol 502 (shown in FIG. 5), asecond bonus symbol 504 (shown in FIG. 6), a third bonus symbol 506(shown in FIGS. 7A and 7B), and a fourth bonus symbol 508 (shown in FIG.8). In some situations, the first reel 406 may display three one-highsymbols or one two-high symbol and one one-high symbol. As describedabove, each bonus symbol 502-508 are single, three-high symbols coveringall three symbol display positions of first reel 406, thus activating anassociated bonus feature. In some embodiments, the gaming device 200 mayspin and stop the first reel 406 before the other reels 404 to reveal abonus symbol before activating the bonus feature, thereby providingenhanced excitement and anticipation for the player.

In example embodiments, symbols in the play area 402 are evaluated fromleft to right as a ways evaluation (e.g., a “Reel Power” evaluation),generating win amounts when one or more feature game symbols are presentfor two or more of the left-most reels (e.g., “2-of-a-kind” being atleast one symbol on the left-most two reels, “3-of-a-kind” being atleast one symbol on each of the left-most three reels, and so forth) andgenerating multipliers on a given reel based on the number of symbolsappearing (e.g., “1×” when only one symbol appears, “×2” when twosymbols appear, and so forth). More specifically, for each reel, thegaming device 200 determines a total number of each particular symbolappearing on that reel and performs a left-to-right evaluation of eachsymbol to determine how many of-a-kind to pay, as well as whichmultipliers may have been achieved based on the number of symbols on thereel. Each of the 3-high bonus symbols 502-508 described herein areevaluated as single wild symbols for purposes of Reel Power evaluation.

FIG. 5 illustrates an example spin result 500 on play area 402 whenfirst bonus symbol 502 is displayed on first reel 406 during a spin.During gameplay, each reel 406-416 may be spun and stopped to display asubset of the symbols of each reel 406-416. In the example embodiment,the appearance of first bonus symbol 502 triggers the gaming device 200to add one or more wild symbols to display positions on the reels 404(e.g., overlaying or replacing the symbol(s) that would otherwise haveappeared on the reels). In some embodiments, the first bonus symbol 502triggers addition of from one to four wild symbols on two of the threecenter reels 408-412 (e.g., a number selected based on an output of theRNG engine 316). In the example shown here, the gaming device 200 addswild symbols at symbol display positions 510, 512 upon the occurrence offirst bonus symbol 502 (e.g., all four symbol positions of reel 408 andthe second symbol position of reel 412). In some embodiments, firstbonus symbol 502 may cause the addition of any number of wild symbols tosymbol display positions of reels 408-416.

In some embodiments, overlays, such as images or characters, mayinitially appear at symbol display positions 510 and 512 while secondreel 408, third reel 410, fourth reel 412, fifth reel 414, and sixthreel 416 continue to spin. In these embodiments, when remaining reels408-416 stop, wild symbols may appear at symbol display positions 510and 512, and the remaining symbol display positions of reels 408-416 maybe populated with symbols. In some embodiments, symbol display positionsof reels 408-416 may populate with prize symbols, such as prize symbol514, and standard symbols, such as standard symbol 516. In the exampleshown here, standard symbols displayed on sixth reel 416, such asstandard symbol 518 may appear with a credit award or a progressivejackpot value. In some embodiments, the occurrence of a pre-determinednumber of feature game scatter symbols 520 causes activation of afeature game, which is described in greater detail below.

FIG. 6 illustrates an example spin result 600 on play area 402 when asecond bonus symbol 504 is displayed on first reel 406 during a spin.The appearance of second bonus symbol 504 triggers the addition of oneor more extension symbol positions 602, 604, 606 above reels 408, 410,412, as well as adding a particular symbols to those extension symbolpositions 602, 604, 606 on reels 408-412. In other words, one or more ofthe extension symbol positions 602, 604, 606 are added to the top ofreels 408-412, and are populated with a particular symbol (e.g., astandard symbol, a wild symbol, a scatter symbol, or such). In theexample embodiment, image symbol 610 is pre-defined as the symbol addedto extension symbol positions 602, 604, 606 when the second bonus symbol504 appears on first reel 406. In other embodiments, the gaming device200 may select a symbol to be added (e.g., selecting a standard symbol,an image symbol, a feature symbol, or such, based on RNG output of theRNG engine 316). Adding one or more expansion symbol display positions602, 604, 606 with symbols to reels 408-412, for example, increases aplayer's chances of higher of-a-kind win awards and further increases aplayer's chances of achieving a trigger condition (e.g., four-of-a-kind,six-of-a-kind) to win an award based upon the symbol evaluation of reels408-416. In the example shown here, the addition of extension symbolpositions 602, 604, 606 and the “JON” image symbols 610 has increasedthe outcome from 3-of-a-kind “JON” image symbols 610 with only ×1multipliers in each of the first three reels to a 6-of-a-kind “JON”image symbols 610 with four ×2 multipliers (e.g., for reels 408, 410,414, and 416, with 2-high “JON” image symbols 610 counting as twosymbols). In addition, since the “JOHN” image symbols 610 completed a6-of-a-kind, and since the “JON” image symbol 610 appearing on the sixthreel 416 includes an additional cash award (e.g., $150.00), the playeris also awarded that additional cash award.

FIGS. 7A and 7B illustrate an example spin result 700 on play area 402when the third bonus symbol 506 is displayed on first reel 406 during aspin. In the example embodiment, during a spin, first reel 406 isstopped to display third bonus symbol 506 while the remaining reels408-416 continue to spin. The display of third bonus symbol 506 on firstreel 406 prompts gaming device 200 to replace third reel 410 with amultiplier ladder (e.g., multiplier thermometer) 702. As shown in FIG.7A, second reel 408, fourth reel 412, fifth reel 414, and sixth reel 416are still in motion (e.g., still spinning) after multiplier ladder 702replaces third reel 410 on play area 402. As reels 408, 412, 414, and416 continue to spin, rungs of multipliers on multiplier ladder 702light up (or change in color and/or size) in ascending order from thebottom to provide a visual cue to the player that a multiplier is beingchosen. The multipliers of multiplier ladder 702 may individually lightup (e.g., from “×2” to “×3” to “×4”) or be removed until gaming device200 stops on an award multiplier 706, as shown in FIG. 7B. As describedherein, award multiplier 706 is a multiplier from multiplier ladder 702that is awarded to the player (e.g., applied to the wager resolution).As shown in FIG. 7B, when an award multiplier 706 (e.g., “×4”multiplier) is displayed, award multiplier 706 will change in sizeand/or color, and remaining reels 408, 412, 414, and 416 willsubsequently stop and populate symbol display positions with symbols.The multiplier ladder 702 itself acts as a single wild symbol for reel 3during evaluation and award determination, while additionally applyingthe determined multiplier 706 to the total number of credits awarded asa result of gameplay of the base game (e.g., under a Reel Powerevaluation).

FIG. 8 illustrates an example spin result 800 on play area 402 whenfourth bonus symbol 508 is displayed on first reel 406 during a spin. Inthe example embodiment, the appearance of fourth bonus symbol 508triggers gaming device 200 to replace the remaining reels 408-416 ofplay area 402 with a new set of special reels 808-816. As shown in FIG.8, special reels 808-816 are different from reels 408-416 (shown in FIG.4). Special reels 808-816 include a set of special symbols that may beexclusive to fourth bonus symbol 508. In some embodiments, specialsymbols may be based on a theme associated with fourth bonus symbol 508.Special symbols may cover one or two symbol display positions. Specialsymbols may include symbols with multipliers (e.g., “×2” and “×3”), suchas symbol 820, and symbols with award values, such as symbol 822. In theexample shown here, in addition to any Reel Power wins, the player winsall the credits and multipliers displayed on play area 402 (e.g.,regardless of whether they appear in an of-a-kind win) and afterapplying all multipliers displayed in the play area 402 (e.g., to eitheror both of the Reel Power wins and the displayed credit wins). In someembodiments, a bet qualifier is associated with the occurrence of fourthbonus symbol 508. For example, a minimum or maximum player betqualification may apply to enable fourth bonus symbol 508 to appear andtrigger the replacement of reels 408-416 with special reels 808-816.

In example embodiments described herein, some 2-high and 3-highmulti-position symbols are used. One problem with using multi-positionsymbols with conventional reel spin and stop methods is a problem withsplit symbols. Typically, stop positions are defined for each singlesymbol position, and 2-high or 3-high symbols may have 2 or 3 stoppositions. However, players may become frustrated when only a portion ofa 2-high or 3-high symbol results after a spin. As such, the exampleembodiments utilize a method of reel spin resolution and play areaconfiguration that avoids such problems.

In the example embodiment, a reel that includes multi-position symbols(e.g., reel 406) is configured with a lookup table that groups symbolpositions, and each group of symbol positions is configured to not haveany partial multi-position symbols. For example, in one embodiment, alookup table is defined for a reel that exposes three symbol positions,such as reel 406, as:

TABLE 1 Example Reel Strip Definition Lookup Table Index Symbols Weight1 Ace 15 Jack Raven 2 King 15 Pic1_A Pic1_B 3 Queen 20 Jack Ace 4 Pic2_A10 Pic2_B Pic2_C 5 Jack 15 King Queen 6 Pic3_A 10 Pic3_B Pic3_C

Each entry in Table 1 (identified by Index) represents a single reelstop position for the example reel. Within each lookup table entry, theSymbols illustrate the symbols to display in the three symbol displaypositions on the reel, as well as the weight attributed to each entry.In other words, when Index 1 is selected (e.g., by the RNG engine 316and RNG conversion engine 320), an Ace symbol is displayed in the top ofthree symbol positions on the reel, a Jack symbol is displayed in themiddle of three symbol positions, and a Raven symbol is displayed in thebottom of three symbol positions, where each of the Ace, Jack, and Ravensymbols are 1-high symbols that fit into a single symbol position. Index2 illustrates how a 2-high symbol may be configured such as not to bepartially displayed. The 2-high symbol, “Pic1”, is identified by twosub-symbols, “Pic1_A” and “Pic1_B”. When Index 2 is selected, the Kingsymbol is displayed in the top position of the reel, and Pic1 isdisplayed in the middle and bottom positions of the reel. In someembodiments, Pic1_A may be the top half of the Pic1 symbol and Pic1_Bmay be the bottom half of the Pic1 symbol. Similarly, two 3-high symbols“Pic2” and “Pic3” are illustrated by Index 4 and Index 6 of the exampleTable 1. When, for example, Index 4 is selected, Pic2 is displayed inits entirety on the reel (e.g., “Pic2_A” in the top position, “Pic2 B”in the middle position, and “Pic2_C” in the bottom position). In someembodiments, such 3-high symbols may be broken into top, middle, andbottom images to completely render the entirety of the 3-high symbol.

In an example embodiment, the following <reelstripdef> configuration maybe used to reflect the 3-high reel of Table 1:

<reelstripdef name=“REEL 1”>

-   -   <stop symbolname=“Ace” weight=“10”/>    -   <stop symbolname=“Jack” weight=“0”/>    -   <stop symbolname=“Raven” weight=“0”/>    -   <stop symbolname=“King” weight=“10”/>    -   <stop symbolname=“Pic1_A” weight=“0”/>    -   <stop symbolname=“Pic1_B” weight=“0”/>    -   <stop symbolname=“Queen” weight=“10”/>    -   <stop symbolname=“Jack” weight=“0”/>    -   <stop symbolname=“Ace” weight=“0”/>    -   <stop symbolname=“Pic2_A” weight=“10”/>    -   <stop symbolname=“Pic2_B” weight=“0”/>    -   <stop symbolname=“Pic2_C” weight=“0”/>    -   <stop symbolname=“Jack” weight=“10”/>    -   <stop symbolname=“King” weight=“0”/>    -   <stop symbolname=“Queen” weight=“0”/>    -   <stop symbolname=“Pic3_A” weight=“10”/>    -   <stop symbolname=“Pic3_B” weight=“0”/>    -   <stop symbolname=“Pic3_C” weight=“0”/>        While some of the individual <stop> entries in the        <reelstripdef> identify individual weights set to zero, each of        those <stop> entries have an effective non-zero weight, namely        the weight of the first of their grouping of three. In other        words, when the non-zero weighted sub-symbol is selected, that        symbol will always occupy the first position in the play area        and the other two “weight=0” symbols will always be the second        and third symbols displayed in the play area. As such, the        non-zero weight of the group is effectively shared with all        three members. As long as the lookup table and <reelstripdef>        are configured to not include any incomplete 2+high symbol        parts, then no partial 2+high symbols will occur. This method        can be used with any height reel (e.g., 4-high reels, 5-high        reels) and any 2+height symbols (e.g., 4-high symbols, 5-high        symbols) up to the height of the reel.

Since the reel strip definition table is not defined with any partialsymbols, no RNG outcome will yield a partial reel. Further, under ReelPower evaluation, the position of each particular symbol within a singleindex is irrelevant for purposes of computing win values. Similarly, areel that exposes four symbol positions, such as reels 408-416, maysimilarly avoid splitting 2+high symbols by defining lookup tables withfour symbols for Index. This method also may satisfy certainjurisdictional requirements since each player has the same opportunityto obtain all winning or losing outcomes, and every symbol displayed isavailable for random selection and inclusion into a game outcome (e.g.,there are no symbols with a weight of zero). While the example Table 1shown here only includes six entries, it should be understood that anynumber of entries can be included.

FIG. 9 illustrates an example spin result 900 in play area 402 thatactivates a feature game during base game play. In the exampleembodiment, the feature game is activated based on the appearance of apre-determined number of feature game scatter symbols (illustrated hereas “×”) 520 displayed on play area 402 after a spin. In this example,three feature game scatter symbols 520 appear (e.g., on reels 408-416)to unlock the feature game. As shown in configuration 900, feature gamescatter symbols 520 are displayed on second reel 408, third reel 410,and fifth reel 414, thereby triggering the feature game.

FIGS. 10A-10E are diagrams illustrating game play progression for anexample game instance of the feature game triggered in FIG. 9. Asexplained above, the feature game is a bonus game separate and distinctfrom the base game. In the example embodiment, the feature game replacesthe reels 404 with a new set of three feature game reels that includes afirst feature game reel 1006, a second feature game reel 1008, and athird feature game reel 1010. The player may initiate each spin usingplayer input button 236. As explained below, in some embodiments, theplayer is awarded five free spins (e.g., one for each round of play ofthe feature game) and may play up to seven rounds of the feature game(e.g., by winning additional free plays on the fifth and sixth spin).

FIG. 10A depicts a feature game play area 1000 for the feature game. Inparticular, FIG. 10A depicts play area 1000 before the gaming device 200initiates a first round of play. Feature game play area 1000 includes acredit stack 1002, a prize position area 1004, and the set of game reels1006, 1008, 1010. Feature game play area 1000 may be displayed using oneor both of primary game display 240 and secondary game display 242 (bothshown in FIG. 2). For example, feature game reels 1006-1010 and prizeposition area 1004 may be displayed on the primary game display 240,which may be positioned below the secondary game display 242, and creditstack 1002 may be presented by secondary game display 242.

In the example embodiment, the feature game provides credit prizes 1012that may be won by the player for each spin. The credit prizes 1012 arerepresented in FIG. 10A as three columns of credit values in the creditstack 1002, and each column associated with one of the reels 1006-1010(e.g., as indicated by the broken line columns). Credit prizes 1012, inthe example embodiment, range from 250 to 25,000, and each credit prize1012 corresponds to one of the seven rounds of play of the feature game.There are seven credit prizes 1012 in each column, sorted from lowest tohighest value, with the lowest credit prize 1012 in each column beingassociated with the first round of play, the next lowest credit prize1012 being associated with a second round of play, and so forth. Duringgame play, one credit prize 1012 in each column shifts down into theprize position area 1004 before the spin, making that credit prize 1012available to win based on the spin result of the associated reel1006-1010. Credit prize cascading is described in greater detail below.

Each of the feature game reels 1006-1010 includes symbol strip thatincludes winning symbols and blank spaces (or non-winning symbols).Further, in some embodiments, each reel 1006-1010 may use one or morewinning symbols that are distinct from other winning symbols on theother reels 1006-1010 (e.g., for thematic purpose). In the exampleembodiment, each reel 1006-1010 presents one symbol display position(e.g., either a single winning symbol or a blank) after a spin. In otherembodiments, reels 1006-1010 may display two or more symbol displaypositions. A blank refers to an empty symbol display position on thereel 1006-1010 (e.g., no symbol shown). During game play, the appearanceof a winning symbol on a reel indicates a win for that reel during thecurrent spin, where the appearance of only blank(s) or non-winningsymbol(s) indicates no win for that reel. In some embodiments, anon-winning symbol representing no win may be used in lieu of an emptysymbol position.

FIG. 10B depicts a first round of play of the feature game instance.When a player initiates gameplay by, for example, pressing a spin button(e.g., a player input button 236), a first prize row 1016 of creditprizes 1012 moves down from credit stack 1002 into prize position area1004. As first prize row 1016 populates prize position area 1004, creditprizes of credit stack 1002 move down (e.g., advancing closer to theprize position area 1004). First prize row 1016 may be highlighted orilluminated to distinguish first prize row 1016 from the other rows ofcredit stack 1002 (e.g., indicating that the credit prizes 1012 in theprize position area 1004 are available to win during this spin). Whilefirst prize row 1012 occupies prize position area 1004, feature gamereels 1006-1010 are spun. As show in FIG. 10B, credit values of “250”are displayed in prize position area 1004 while reels 1006-1010 are inmotion.

FIG. 10C depicts an outcome of the first round of play after featuregame reels 1006-1010 have stopped spinning. In the example embodiment,each feature game reel 1006-1010 exposes either a winning symbol or anempty position. When a winning symbol (e.g., winning symbols 1052, 1054)is displayed after the spin, the player wins the credit prize 1012 forthat reel (e.g., the credit prize 1012 in the prize area 1004 above thatreel). When an empty position 1050 is displayed, the player does not winthe credit prize 1012. In this example, first feature game reel 1006display an empty position, and second and third reels 1008, 1010 displayprize symbols 1052, 1054. As such, the player does not win the 250credit prize above the first reel 1006, but does win both of the 250credit prizes above the second and third reels 1008, 1010. Credit prizesabove each feature game reel 1006-1010 are removed from prize positionarea 1004 after each reel is evaluated. For example, when second featuregame reel 1008 displays the prize symbol 1052, the credit prize andcorresponding multiplier above second feature game reel 1008 may beremoved or disappear (e.g., after a multiplied credit value isdetermined, as described below). In another example, when a reel, suchas first feature game reel 1006 displays a blank symbol, the creditprize is removed from prize position area 1004 and not awarded to theplayer.

In the example embodiment, each reel 1006-1010 includes an associatedmultiplier 1020. The multiplier 1020 for each reel starts at an “×1”multiplier value (e.g., at the beginning of a spin). After a spin iscompleted, if a win is achieved for a particular reel 1006-1010, thecurrent multiplier 1020 for that reel is applied to the credit prize1012 to determine the total award for the player. During the first spinshown in FIG. 10B, the associated multipliers 1020 are not displayedsince they are only “×1” (e.g., thus having no impact on the totalaward).

After evaluating each spin result, the associated multiplier(s) 1020 forany winning reels (e.g., reels 1008, 1010, here) are advanced. In theexample embodiment, an ordered list of seven multipliers (“multiplierarray”) is pre-configured as (“×1”, “×2”, “×3”, “×5”, “×10”, “×11”, and“×12) and advancing the reel multiplier for a winning reel includeschanging the reel multiplier for that reel to the next highestmultiplier in the multiplier array. In this example, the multipliers1020 for reels 1008, 1010 are advanced from “×1” to “×2”. Thismultiplier 1020 is displayed to the player after resolution of thecurrent spin, indicating to the player that the updated multipliers 1020shown in FIG. 10C will apply to the next spin. For any losing reels(e.g., reel 1006), the multiplier 1020 for that reel is reset to “×1”(the base value). It should be understood that the multipliers 1020shown in FIG. 10C are illustrated with their values after resolution ofthe first spin, and will thus be applied to the results of the next spinresult and not the current spin result shown in FIG. 10C.

FIG. 10D depicts a second round of play after feature game reels1006-1010 are stopped. When the player initiates the second round ofgameplay, a second prize row 1016 of credit prizes shift down fromcredit stack 1002 into prize position area 1004. As second prize row1016 populates prize position area 1004, credit prizes of credit stack1002 proceed to move down within the credit stack 1002. As shown in FIG.10D, second feature game reel 1008 displays blank symbol 1050,indicating a no-win event, where reels 1006, 1010 display prize symbols1056, 1054, respectively. The occurrence of prize symbol 1056 indicatesthat the player wins the credit prize (e.g., “250”) for first featuregame reel 1006. During prize evaluation, since the first reel 1006 didnot win during the previous spin, the applicable multiplier 1020 is“×1”, and thus has no impact on the award for that reel 1006. As such,the player wins 250 credits for reel 1006. Since the second reel 1008 isblank, no credit award is won. The occurrence of prize symbol 1054indicates that the player wins the credit prize (e.g., “250”) for thethird game reel 1010. Further, since the third reel 1010 won during thefirst spin, the “×2” multiplier shown in FIG. 10B is effective for thecurrent spin. As such, the player is awarded 250×2=500 credits for thethird reel 1010.

After resolution of the second round, the gaming device 200 updates themultipliers for the reels 1006-1010. More specifically, since the firstreel 1006 won this round, the multiplier 1020 for the first reel 1006 isadvanced to “×2”. Since the third reel 1010 won this round, themultiplier 1020 for the third reel 1010 is advanced from “×2” to “×3”.Since the second reel 1008 lost this round, the multiplier 1020 for thesecond reel 1008 is reset to “×1”.

FIG. 10E depicts a third round of play after reels 1006-1010 arestopped. When the player initiates the third round of gameplay, a thirdprize row 1018 of credit prizes shift down from credit stack 1002 intoprize position area 1004. As third prize row 1018 populates prizeposition area 1004, credit prizes of credit stack 1002 continue to shiftdown. As shown in FIG. 10E, each of the feature game reels 1006, 1008,1010 displays prize symbols 1056, 1052, 1054, respectively. Theoccurrence of prize symbol 1056 indicates that the player wins thecredit prize 500×2=1,000 credits for first feature game reel 1006, andthe associated multiplier 1020 is then increased to “×3”. The occurrenceof prize symbol 1052 indicates that the player wins the credit prize500×1=500 credits for second feature game reel 1008, and the associatedmultiplier 1020 is then increased to “×2”. The occurrence of prizesymbol 1054 indicates that the player wins the credit prize 500×3 forthird feature game reel 1010, and the associated multiplier 1020 is thenincreased to “×4”.

In the example embodiment, the applicable multiplier is increased inincreasing amounts (e.g., ×2, ×3, ×5, ×10, and so forth, as defined inthe multiplier array). In some embodiments, the applicable multiplierfor a round of gameplay is increased in increments of one (e.g., ×2, ×3,×4, and ×5). The application of multipliers in conjunction with theincreasing credit award values of later rounds allows the feature gameto offer increased volatility, while RTP may be controlled based ondetermined probabilities of having the various multipliers at thevarious rounds of play. Since the sixth and seventh rounds have thelargest values, those awards will be less frequent since they will onlybe winnable if the player wins at least once on the fifth round of play.

Although not shown in FIGS. 10A-10E, in the example embodiment, twoadditional rounds of play continue until a player is out of free spins(e.g., five free spins). During the fourth round of play, a fourth prizerow of credit prizes 1012 descend from credit stacks 1002 into prizeposition area 1004. The fourth prize row includes credit prize having avalue of “500.” Game play will operate in substantially the same manneras described above. During the fifth round of play, a fifth prize row ofcredit (not shown) will descend from credit stacks 1002 into prizeposition area 1004. Each credit prize of the fifth prize row has a valueof “1000.”

By the end of the fifth round of gameplay, six potential credit prizesremain in credit stack 1002 for potentially a sixth and seventh round ofplay. In the example embodiment, a player is awarded a sixth round ofplay (e.g., a free sixth spin) if at least one credit prize 1012 is wonduring the fifth round of play. Subsequently, if the player advances onto the sixth round of play, the player will need to win at least onecredit prize during gameplay to be awarded a seventh and final round ofplay. As shown in FIG. 10E, the credit prizes allotted for the seventhround of play are “5000” for first feature game reel 1006, “25000” forsecond feature game reel 1008, and “5000” for third feature game reel1010. Furthermore, as the credit prizes reserved for the seventh roundof gameplay are significant, the feature game may encourage players toactively play the example base game (as shown in FIGS. 4-9) in effortsto reach the sixth and seventh round of gameplay, thereby increasingplayer in the base game and improving user interaction with the gamemachine.

FIGS. 11A-11B are a flowchart 1100 for a method of providing the basegame features and feature game described herein. In the exampleembodiment, the method is performed by an EGM such as gaming device 200using the six-reel configuration illustrated in FIG. 4 for the base gameand the three-reel configuration illustrated in FIGS. 10A-10E for thefeature game. In some embodiments, one or more of the operations of thismethod may be performed by a backend server (e.g., server systems 108,110, 112, 114, or the like). In FIG. 11A, the method begins withinitiating a play of the base game at operation 1102 (e.g., uponsubmission of a wager by a player). At operation 1104, the gaming device200 begins all reels spinning and resolves (e.g., stops) reel 1. If, attest 1106, no bonus symbol is displayed, then the gaming device 200resolves the remaining reels (e.g., reels 2-6) at operation 1108. Atoperation 1110, the gaming device 200 determines a wagering outcome ofthe spin result (e.g., under a Reel Power evaluation) and awards theplayer the determined amount. At test 1112, the gaming device 200evaluates the spin result to determine if the feature game triggercriteria are met (e.g., the appearance of three scatter symbols or such,as described above with respect to FIGS. 4 and 9. If the feature gametrigger criteria are not met, then the gaming device 200 returns tooperation 1102 to allow the player to initiate the next round of play.If the feature game trigger criteria are met, then the feature game isactivated. FIG. 11B illustrates additional details regarding the featuregame.

Returning to operation 1106 of the base game, if a bonus symbol doesappear on reel 1, then the gaming device 200 activates the associatedfeature (e.g., based on which bonus symbol appears). Bonus symbols andtheir various features are described above with respect to FIGS. 5-9. Inthe example embodiment, if the first bonus symbol (e.g., as shown anddescribed in FIG. 5) appears on reel 1 at test 1120, then the gamingdevice 200, at operation 1122, determines a number of wild symbols to beadded and their various positions of appearance on the play area. Atoperation 1124, the gaming device 200 populates the additional wildsinto the determined reel positions and then returns to operation 1108 tocontinue resolving reels 2-6 and evaluating the outcome of the spin(e.g., with the additional wilds overlaying or replacing other symbolsat their determined positions).

If, at test 1130, the second bonus symbol (e.g., as shown and describedin FIG. 6) appears on reel 1, then the gaming device adds additionalsymbol positions (e.g., expansion symbol positions) to the reels (e.g.,to one or more of reels 2, 3, and 4) at operation 1132. The gamingdevice 200 then populates those expansion symbol positions with adetermined symbol at operation 1134 and continues to operation 1108,resolving reels 2-6 and evaluating the outcome of the spin (e.g., withthe additional expansion positions and their associated symbols beingconsidered in the final evaluation).

If, at test 1140, the third bonus symbol (e.g., as shown and describedin FIGS. 7A-7B) appears on reel 1, then the gaming device 200 replacesreel (e.g., reel 3) with a multiplier ladder. The gaming device 200determines which multiplier from the multiplier ladder to award to theplayer and displays an animation to illustrate which multiplier theplayer has won at operation 1144. Then gaming device 200 then continuesto operation 1108, resolving reels 2-6 (excluding reel 3, since themultiplier ladder acts as a single wild symbol for that reel) andevaluating the outcome of the spin (e.g., with the awarded multiplierfrom the multiplier ladder being factored into the final evaluation).

If, at test 1150, the fourth bonus symbol (e.g., as shown and describedin FIG. 8) appears on reel 1, then the gaming device 200 replaces reels2-6 with a special set of reels at operation 1152. Operation 1152 mayinclude determining award values for one or more symbols on the specialset of reels. At operation 1154, the gaming device 200 resolves the spinof the special set of reels (e.g., stopping the spinning reels based onan RNG result from the RNG engine 316). At operation 1156, the gamingdevice 220 identifies all of the award values resulting from the spin(e.g., credit awards) and any multipliers that appear on the spinresult. At operation 1158, the gaming device 220 determines a totalwagering outcome for the player at operation 1158 (e.g., multiplying thetotal credit awards by each of the identified multiplier(s)), awardingthe player the total amount. The gaming device 200 then returns tooperation 1102 to begin another round of play.

FIG. 11B illustrates operations for game play of the feature gameactivated during play of the base game in FIG. 11A. In the exampleembodiment, the gaming device 200 replaces the base game reels (e.g.,reels 404) with a set of three feature game reels (e.g., reels 1006,1008, 1010) at operation 1160. At operation 1162, the gaming device 200initializes the prize position area 1004 with three empty prizepositions, one above each of the three feature game reels. Further, eachreel has an associated reel multiplier that is set to a base value of“×1”. At operation 1164, the gaming device 200 creates credit stacks(e.g., one for each of the three reels). Each credit stack isinitialized with seven credit prizes, each one corresponding to one ofseven potential rounds of feature game play. The lowest two creditprizes and the highest credit prize in each credit stack are populatedwith a pre-determined credit award at operation 1166. At operation 1168,the gaming device 200 determines and populates credit prize values forthe third through the sixth credit prizes in each credit stack (e.g.,from a set of pre-determined potential credit prize values). Atoperation 1170, the gaming device 200 awards the player five free spinsand begins feature game play for the first round (e.g., round=1).

At operation 1172, the gaming device 200 moves the lowest credit awardfrom each credit stack into the prize position area above the associatedreel. The gaming device 200 initiates and resolves a spin of the featuregame reels (e.g., where each feature game reel shows either a winningsymbol or a non-winning symbol/blank after the spin). At operation 1176,for each reel showing a winning symbol, the gaming device 200 awards thecredit award in the prize position above that reel multiplied by thecurrent reel multiplier for that reel. For example, if the credit awardshowing in the prize position above a winning reel showed 250 creditsand the current reel multiplier for that reel was ×2, the player wouldbe awarded 500 credits for that reel. At operation 1178, for eachwinning reel (e.g., each reel showing a winning symbol), the gamingdevice 200 advances the reel multiplier for that reel (e.g., per thepre-configured multiplier array). In some embodiments, advancing thereel multiplier may include incrementing the multiplier by 1. Atoperation 1180, for each non-winning reel (e.g., each reel not showing awinning symbol), the gaming device 200 resets that associated reelmultiplier to “×1”. If, at test 1182, the feature game is at or beforethe end of the fourth round of play (e.g., round<5), then the gamingdevice 200 increments the round counter and clears the prize positionsat operation 1184 and begins the next round of play, returning tooperation 1172. If, at test 1182, the feature game is at the end of thefifth round of play or later (e.g., round>=5), then the gaming device200 checks to see if the seventh round is been concluded. Morespecifically, if, at test 1186, the feature game at the end of theseventh round (e.g., round=7), then the gaming device 200 concludes thefeature game at operation 1188 and returns to the base game at operation1102. If, at test 1186, the feature game is not at the end of theseventh round (e.g., round=5 or 6), then the gaming device 200 testswhether, during the fifth or sixth rounds, any winning reels werepresent in this latest spin. If the player achieved no winning symbolson the current round, then the gaming device 200 concludes the featuregame at operation 1188. If, however, the player did achieve at least onewinning symbol during the round (e.g., during rounds five or six), thenthe gaming device proceeds to another round of play, incrementing theround counter and clearing the prize positions at operation 1184 andbeginning the next round of feature game play at operation 1172.

A computer, controller, or server, such as those described herein,includes at least one processor or processing unit and a system memory.The computer, controller, or server typically has at least some form ofcomputer readable non-transitory media. As used herein, the terms“processor” and “computer” and related terms, e.g., “processing device”,“computing device”, and “controller” are not limited to just thoseintegrated circuits referred to in the art as a computer, but broadlyrefers to a microcontroller, a microcomputer, a programmable logiccontroller (PLC), an application specific integrated circuit, and otherprogrammable circuits “configured to” carry out programmableinstructions, and these terms are used interchangeably herein. In theembodiments described herein, memory may include, but is not limited to,a computer-readable medium or computer storage media, volatile andnonvolatile media, removable and non-removable media implemented in anymethod or technology for storage of information such as computerreadable instructions, data structures, program modules, or other data.Such memory includes a random access memory (RAM), computer storagemedia, communication media, and a computer-readable non-volatile medium,such as flash memory. Alternatively, a floppy disk, a compact disc-readonly memory (CD-ROM), a magneto-optical disk (MOD), and/or a digitalversatile disc (DVD) may also be used. Also, in the embodimentsdescribed herein, additional input channels may be, but are not limitedto, computer peripherals associated with an operator interface such as amouse and a keyboard. Alternatively, other computer peripherals may alsobe used that may include, for example, but not be limited to, a scanner.Furthermore, in the example embodiment, additional output channels mayinclude, but not be limited to, an operator interface monitor.

As indicated above, the process may be embodied in computer software.The computer software could be supplied in a number of ways, for exampleon a tangible, non-transitory, computer readable storage medium, such ason any nonvolatile memory device (e.g. an EEPROM). Further, differentparts of the computer software can be executed by different devices,such as, for example, in a client-server relationship. Persons skilledin the art will appreciate that computer software provides a series ofinstructions executable by the processor.

While the invention has been described with respect to the figures, itwill be appreciated that many modifications and changes may be made bythose skilled in the art without departing from the spirit of theinvention. Any variation and derivation from the above description andfigures are included in the scope of the present invention as defined bythe claims.

While the invention has been described with respect to the figures, itwill be appreciated that many modifications and changes may be made bythose skilled in the art without departing from the spirit of theinvention. Any variation and derivation from the above description andfigures are included in the scope of the present invention as defined bythe claims.

What is claimed is:
 1. An electronic gaming machine comprising: at leastone display device; a player input interface configured to receiveplayer input from a player; a credit input device configured to receivea credit wager; and a game controller configured to execute instructionsstored in a tangible, non-transitory, computer-readable storage medium,which, when executed by the game controller, cause the game controllerto at least: determine, during a base game initiated in response toreceiving the credit wager, that a feature game trigger condition issatisfied; activate, in response to the feature game trigger condition,a feature game within the base game, the feature game including aplurality of feature game reels; display, on the at least one displaydevice and in response to activating the feature game, the plurality offeature game reels, a prize position area positioned above the pluralityof feature game reels, and a credit stack positioned above the prizeposition area, the credit stack includes credit prizes potentiallyavailable to be won by the player; automatically move at least onecredit prize from the credit stack into the prize position area;generate a first game outcome based on a random number generator todisplay one or more symbols for each of the plurality of reels;determine that at least one of the displayed symbols for the first gameoutcome is a winning symbol; provide the at least one credit prize inresponse to the determining; increase a multiplier by a predeterminedamount based on the determining; and display, on the at least onedisplay device, the multiplier as an applicable multiplier for asubsequent credit prize won during a subsequent spin.
 2. The electronicgaming machine of claim 1, wherein the credit stack includes a pluralityof columns, each column of the plurality of columns is associated with afeature game reel of the plurality of feature game reels and a prizeposition of a plurality of prize positions within the prize positionarea, wherein automatically moving at least one credit prize from thecredit stack into the prize position area includes moving a credit prizefrom each column of the plurality of columns into the prize positionassociated with column.
 3. The electronic gaming machine of claim 2,wherein each prize position of the plurality of prize positions includesan associated multiplier, wherein increasing a multiplier includesincreasing a multiplier associated with a feature game reel displaying aprize symbol.
 4. The electronic gaming machine of claim 1, wherein theinstructions further cause the game controller to: generate a secondgame outcome on the plurality of reels; apply the multiplier to anothercredit prize from the credit stack to generate a multiplied creditprize; and provide the multiplied credit prize as a second game award.5. The electronic gaming machine of claim 1, wherein the instructionsfurther cause the game controller to: generate a second game outcome onthe plurality of reels; determine that the second game outcome does notinclude a prize symbol; and reset the multiplier to a predetermined basevalue.
 6. The electronic gaming machine of claim 1, wherein each of theplurality of reels displays at least one of a prize symbol associatedwith each reel and a blank symbol, wherein display of the associatedprize symbol triggers a corresponding credit prize from the prizeposition area to be awarded.
 7. The electronic gaming machine of claim1, wherein the credit prizes of the credit stack are arranged inascending order based on credit values.
 8. The electronic gaming machineof claim 1, wherein the instructions further cause the game controllerto award an additional free spin when, during a final free spin, atleast one of the plurality of reels displays a prize symbol.
 9. Theelectronic gaming machine of claim 1, wherein each prize row of thecredit stack corresponds to a free spin, and wherein the number of freespins provided to a player is less than a total number of prize rows inthe credit stack.
 10. A non-transitory computer-readable mediacontaining instructions embodied thereon which, when executed by atleast one processor, cause the at least one processor to: cause to bedisplayed, on at least one display device of an electronic gaming deviceand in response to activating a feature game, a plurality of featuregame reels, a prize position area positioned above the plurality offeature game reels, and a credit stack positioned above the prizeposition area, the credit stack includes credit prizes potentiallyavailable to be won by the player; generate a first game outcome basedon a random number generator to display one or more symbols for each ofthe plurality of reels; determine that at least one of the displayedsymbols for the first game outcome is a prize symbol; provide the atleast one credit prize in response to the determining; increase amultiplier by a predetermined amount based on the determining; and causeto be displayed, on the at least one display, the multiplier as anapplicable multiplier for a subsequent credit prize won during asubsequent spin.
 11. The non-transitory computer-readable medium ofclaim 10, wherein the credit stack includes a plurality of columns, eachcolumn of the plurality of columns is associated with a feature gamereel of the plurality of feature game reels and a prize position of aplurality of prize positions within the prize position area.
 12. Thenon-transitory computer-readable medium of claim 11, wherein each prizeposition of the plurality of prize positions includes an associatedmultiplier, wherein increasing a multiplier includes increasing amultiplier associated with a feature game reel displaying a prizesymbol.
 13. The non-transitory computer-readable medium of claim 10,wherein the instructions further cause the at least one processor to:generate a second game outcome on the plurality of reels; apply themultiplier to another credit prize from the credit stack to generate amultiplied credit prize; and provide the multiplied credit prize as asecond game award.
 14. The non-transitory computer-readable medium ofclaim 10, wherein the instructions further cause the at least oneprocessor to: generate a second game outcome on the plurality of reels;determine that the second game outcome does not include a prize symbol;and reset the multiplier to a predetermined base value.
 15. Thenon-transitory computer-readable medium of claim 10, wherein each of theplurality of reels displays at least one of a prize symbol associatedwith each reel and a blank symbol, wherein display of the associatedprize symbol triggers a corresponding credit prize from the prizeposition area to be awarded.
 16. The non-transitory computer-readablemedium of claim 10, wherein the credit prizes of the credit stack arearranged in ascending order based on credit values.
 17. Thenon-transitory computer-readable medium of claim 10, wherein theinstructions further cause the at least one processor to award anadditional free spin when, during a final free spin, at least one of theplurality of reels displays a prize symbol.
 18. The non-transitorycomputer-readable medium of claim 10, wherein each prize row of thecredit stack corresponds to a free spin, and wherein the number of freespins provided to a player is less than a total number of prize rows inthe credit stack.
 19. A method of electronic gaming implemented on anelectronic gaming machine, the electronic gaming machine comprising atleast one processor, at least one display device, a player inputinterface, a game controller, and a credit input mechanism, the methodcomprising: displaying, on the at least one display device and inresponse to activating the feature game, the plurality of feature gamereels, a prize position area positioned above the plurality of featuregame reels, and a credit stack positioned above the prize position area,the credit stack includes credit prizes potentially available to be wonby the player; animating, on the at least one display device, moving afirst row of credit prizes from the credit stack into the prize positionarea; displaying one or more reel spins that land on a symbol for eachof the plurality of reels; presenting, on the at least one displaydevice, that at least one credit prize from the first row of creditprizes has been awarded for one or more reels that land on a winningsymbol; animating, on the at least one display device, moving a secondrow of credit prizes from the credit stack into the position area;increasing a multiplier by a predetermined amount based on thedetermining; and displaying, on the display, the multiplier as anapplicable multiplier for a subsequent credit prize won during asubsequent spin.
 20. The method of claim 19, wherein the credit stackincludes a plurality of columns, each column of the plurality of columnsis associated with a feature game reel of the plurality of feature gamereels and a prize position of a plurality of prize positions within theprize position area, wherein each prize position of the plurality ofprize positions includes an associated multiplier, the method furthercomprising: increasing a multiplier by a predetermined amount based on awinning result; and displaying, on the at least one display device, themultiplier as an applicable multiplier for a subsequent credit prize wonduring a subsequent spin.